Good effort for your first Instructable. It is not clear to me in the video as you move very fast on the keystrokes, but is the output tied to key numbers like press 3 and you get three flashes of the LED?

But no it is not tied to any key number as you press 3 and you get three flashes of the LED, it just shows that any key u press is activating the IR LED as we cannot see the IR light with our eyes it helps to see the signal which flashes